Following here from my thread.

Odd that you have partition woes, to me. That said, I have defaulted, for a long time, to not have fancy partition schemes. Where fancy is embarrassingly vague, of course; but the general idea is that extra partitions are largely solving problems from decades past. Worse, it leads to the swap and kernel space problems rather quickly. Though, swap into freezes is new to me.

Hibernate is one that I have heard a ton of troubles with. Largely with laptops. Good luck getting past it.

I am surprised you have had issues with the steam deck. That thing has been rock solid for me. Almost certainly my luck on the games I prefer.

Edit: I do want to underline my point about luck on my part. And good luck to you! I don't claim to have a panacea here. I also don't think it is some failing of anyone that some folks would stick with Windows or other.